Yes, it can. It is an aerobic biological wastewater treatment plant (WWTP) that is automatically adapted for reduced inflow of wastewater to maintain its biological function for as long as possible (by limiting aeration and supplementing substrates for microorganisms from the accumulation tank). The TOPAS S type WWTPs were tested for operational maintenance after 3 and 6 months of interrupted inflow. The testing was conducted by the Engineering Testing Institute Brno (SZÚ Brno). We initiated this testing based on the requirements of our Swedish and later Norwegian significant buyers of our domestic treatment plants, as required by local water authorities. Therefore, we had TOPAS S 7 and TOPAS S 10 WWTPs, supplemented with a sand filter and phosphorus removal dosing, which we commonly supply to these markets under the trade name TOPAS Plus (i.e., plus dosing), tested. The WWTPs were installed in the standard way and then completely cut off from the inflow. At one plant, the inflow was resumed after 3 months and at the other, after 6 months of interruption. Six samples were taken from both plants over 10 days after inflow resumption. The cleaning efficiency results were virtually the same in both cases. The outflow concentrations of treated wastewater from the WWTPs were within the limits required by national legislation for the given WWTP size in all six samples taken during the first 10 days after resumption of inflow. The average efficiencies achieved in the first 10 days were close to those achieved during CE certification. For this capability, tested by the testing institute, the TOPAS WWTP was awarded the Grand Prix at the international trade fair For Arch 2018 in Prague.